JPH09826A - Rotary filter and filtration method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter apparatus unnecessary for the washing and replacement of a filter element. SOLUTION: A filter element 6 is rotated within a cylindrical filter housing 10 and a fluid is introduced into the filter housing 10 form an inflow port 12 to be capable of flowing to the annular path around the filter element 6 within the region between the filter housing 10 and the filter element. Particles removed by filtering rebound from a filter material while the fluid passes through the filter element 6 to be discharged from an outflow port 13 of the filter apparatus.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a filtering device for removing particles in a fluid. The filter element, which has a substantially cylindrical shape, is rotatably mounted in the filter housing and has a structure in which the fluid flows from the outside to the inside.

[0002]

2. Description of the Related Art Generally, there is known a filter device which sucks a fluid containing particulate contaminants from the pores of a filter medium (filter material). Only the contaminant particles in the fluid remain in the filter media and the fluid passes through the filter media.

[0003]

Such filter media having pores have a certain flow resistance,
This flow resistance gradually increases as the filter medium becomes more dirty. Over time, this flow resistance increases to the point where the filter media has to be cleaned, but cleaning the filter media requires considerable manual labor and considerable cost.

The object of the present invention is to provide a filtration device which is essentially self-cleaning.

[0005]

According to the present invention, the above object is achieved by a filtration device having the following features. That is, the filter element can be rotated at such a high speed that almost all the contaminant particles that have entered the flow of the fluid that flows in the vicinity of the filter element are acted upon by the structure of the filter element and are repelled toward the outside of the filter element. What is possible is that the fluid flows substantially in contact with the filter element, and the circumferential direction of the fluid flow corresponds to the rotational direction of the filter element.

Considering the fluid flow, the filter device is designed as follows. That is, in the filtration device, the fluid flows along an annular path in contact with the filter element. At this time, the fluid can pass through the filter element, but the contaminant particles contained in the fluid are
It is repelled away from it by the filter element rotating at a fairly high speed.

A particularly good filtering effect is obtained when the flow direction of the fluid coincides with the rotation direction of the filter element.

The effect of the filter device according to the invention is that the filter does not get contaminated particles removed by filtration of the fluid from clogging the pores of the filter element or fixing these particles on the filter element. The element is not contaminated. Therefore, there is no need to replace or clean the filter element. The removed contaminant particles settle below the filter housing and settle there. An evacuation lock is provided at the bottom of the filter housing from which precipitated particles can be removed.

The effects of further development of the present invention are described in the dependent claims.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the present invention will be described with reference to FIGS. The filter device is a filter housing 1
0, in which the filter element 6 is rotatably mounted. The filter housing 10 has a substantially cylindrical shape, and its lower end portion is formed into a funnel shape. An inlet 12 is provided in the lower area of the filter housing for the fluid to be filtered. The filter housing 10 and the inlet 12 are the inlet 1
The fluid introduced from 2 is disposed at a substantially right angle to the longitudinal axis of the filter housing, and the cylindrical filter housing 10
Is designed to flow into the filtration device against the walls of the. An outlet 13 for discharging the filtered fluid is formed in the upper part of the filter housing 10.

The filter element 6 likewise has a substantially cylindrical outer contour. The filter element 6 is mounted in the filter housing 10 such that a space is maintained between the inner wall of the filter housing 10 and the outer contour of the filter element 6.

In this space region, the fluid introduced from the inflow port 12 so as to contact the wall of the filter housing 10 passes through the filter element 6 and is discharged from the outflow port 13 to the outside of the filtering device. In the meantime, it circulates around the filter element 6. in this way,
The fluid flow is formed around the filter element 6. The direction of rotation of the flow corresponds to the direction of rotation of the rotary filter element 6.

The operation of the filtration device according to the present invention will be described with reference to FIG. On its annular path, the fluid circulating in the region around the rotating filter element has a much lower circumferential velocity than the filter element. The particles carried in the fluid are subjected to centrifugal forces due to the annular motion of the fluid, which results in the particles being carried away from the filter element.

However, when the fluid passes through the filter element and leaves the filtering device in the filtered state from the outlet 13, the particles to be removed are carried in the direction approaching the filter element against the centrifugal force. Be done. The particles then impinge on the filter element, which is rotating at a sufficiently high speed, and bounce off of it, so that it remains in the annular path in the region between the filter element 6 and the housing 10. This process is repeated over and over until the circulating particles settle down due to the action of gravity and settle on the bottom of the filter housing. Particles impinging on the filter element do not enter the pores of the filter element because of the high speed rotation of the filter element or because of insufficient energy to remain in the pores of the filter media under centrifugal force. Being kicked out of. Therefore, the filter element is not contaminated.

Optimal flow conditions occur in the region between the filter element 6 and the filter housing 10 when the turbulence in the fluid flow is minimal. Along the wall of the filter housing 10, there is a laminar flow layer.
Preferably, the particles sink down in this layer. Contaminant particles enter this layer by being subjected to centrifugal forces and, on the one hand, by being repelled from the filter element.

The fluid inlet 12 has a filter housing 1
A particularly uniform distribution of the flow is realized by being provided at the bottom of 0 and the outlet 13 being provided at the top of the filter housing 10. That is, with such a structure, an upward annular flow of fluid is formed in the region between the filter housing and the filter element,
The fluid containing particles is very evenly distributed over the surface of the filter element.

Almost any standard filter material can be used as the filter medium as long as it has a cylindrical structure extending in the longitudinal direction. Also, a smooth filter cloth can be used, which will be described in detail later.

The filter element 6 suitable for the filtering device according to the invention can essentially have the following structure. A tubular filter element is mounted between the disc-shaped upper member and the disc-shaped lower member. There is an opening in the center of the upper member from which filtered fluid can be discharged. At least one of the upper member and the lower member is rotatably mounted in the filter housing.

According to the embodiment of FIG. 1, the filter element is made of a porous sheet. The mesh of this porous sheet is arranged in the vertical and horizontal directions with respect to the rotation axis of the filter element. The web of porous sheets extending along the length of the cylinder is essential for filtration.

In another configuration, the filter element is composed of a plurality of plate-shaped members which are evenly arranged along the peripheral surface and extend in the lengthwise direction. The distance between the plate-shaped members is, for example, 1 mm, and the thickness of the plate-shaped members is, for example, 4 mm. The entire filter element has, for example, a diameter of 6 cm to 8 cm,
The height is 20 centimeters. The plate member or the porous sheet can be covered with a filter cloth. In this way, the completed product can be referred to as a "filter medium".

In the third configuration of the filter element, the filter cloth is attached between the upper member and the lower member. It is particularly suitable for this filter cloth to be made from a fabric woven with thick threads in the longitudinal direction of the cylinder and with fine threads along the circumferential direction. When compared with a filter element in which a porous sheet or a plate-like member is covered with a filter cloth, in the third configuration, the same filtering action can be obtained even when the filter element is rotated at a lower speed. Such an effect is obtained by arranging the vertical elements, which are indispensable for the filtering action, in a higher density. Nevertheless, of course, the filter cloth must have sufficiently large passages for the fluid to be filtered to pass through. The lower rotational speed of the filter element reduces the load on the bearings and reduces vibrations that can occur due to unbalance of the filter element due to rotation.

In another configuration, the filter element has a hollow ceramic body, which has a plurality of holes extending in the direction of the outlet from the outside to the inside. Such an arrangement is particularly suitable for filtering liquids.

FIG. 4 (a) is a sectional view of another embodiment of the filtering device according to the present invention. Filter housing 10
Is essentially designed in the shape of a cylinder of revolution. The filter housing 10 is closed at its upper end by a cover 1. Cover 1
Are fixed to the filter housing by clips 2. A ball bearing 3 is attached to the central portion of the cover 1, and an upper member 5 of the filter element 6 is attached thereto. The bearing shaft of the upper member 5 is hollow and penetrates the cover through a corresponding opening provided in the cover. Upper member 5
This hollow bearing shaft of the forms an outlet 13 from which filtered fluid can be discharged.

The rotary seal 4 seals the cover 1 against the bearing shaft of the filter element 6 in the vicinity of the ball bearing 3.

The lower end of the filter housing 10 is tapered like a funnel, and the front end is a connecting piece having a discharge lock 11. By opening the discharge lock 11, contaminants accumulated in the lower part of the filter housing can be removed. A bearing block 9 is provided above the funnel-shaped taper of the filter housing 10. The bearing block 9 supports the ball bearing 8 located at the center of the filter housing 10. The bearing block 9 has four radial columns that radially extend toward the wall of the filter housing 10 (FIG. 4B).
See the cross-section). The bearing block 9 is connected to the filter housing 10 by these columns. In the lower region of the filter housing, an inlet 12 is provided above the support of the bearing block 9 for the fluid to be filtered.

A filter medium made of, for example, a filter cloth is placed between the upper member 5 and the lower member 7. A plurality of thin pieces 7a directed in the radial direction are attached to the lower side of the lower member 7, and the lower end portion thereof substantially coincides with the height of the inflow port 12. The upper member 5, the filter medium, and the lower member 7 form a rotor, which can be externally driven by the bearing shaft. Attached to the lower member 7,
These flakes 7a that act like blowers or fans
Thus, the fluid flowing from the inflow port 12 flows along the annular path in the space area between the rotating filter medium and the wall of the filter housing 10.

FIG. 4 (b) is a sectional view of the filtering device of FIG. 4 (a). From this view, the center of the filter element 6 inside the filter housing 10 can be seen. Furthermore, the structure of the support column of the bearing block 9 and the inflow port 12 can be seen.

FIG. 4 (c) is a sectional view of the column of the bearing block 9. The struts have an elongated elliptical cross section. Filter element 6 and filter housing 1
Particles that fall in the space region between the zero walls fall from between the columns and settle on the funnel-shaped tip of the filter housing 10 without depositing on the columns.

FIG. 5 is a diagram showing the construction of the filtering device according to the present invention. In the figure, three filter elements 6 are juxtaposed in a common filter housing 10.

Distributing pipes 15 are arranged laterally at the bottom of the filter housing 10, by means of which the fluid to be filtered is distributed to the three inlets for each of the three filter elements 6.
At the top of the filter housing 10 is a common outlet 1.
3'is provided. Furthermore, the filter housing 1
A driving device 14 is attached to the upper part of 0. The drive 14 can rotate the three filter elements by a drive belt or other suitable drive means. The filter housing 10 is divided into two chambers, and the rotating filter element group 6 is housed in one of the lower chambers. The fluid discharged from the three filter elements is shared by the common outlet 1
Sent to the upper second chamber with 3 '.

[0031]

According to the filtration device of the present invention, since the contaminant particles to be removed by filtration do not clog the pores of the filter element or settle on the filter element, the filter element is contaminated. Never. Therefore, there is no need to replace or clean the filter element. The contaminant particles removed by filtration settle below the filter housing and settle there. An evacuation lock is provided at the bottom of the filter housing, from which precipitated particles can be removed.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a filtration device according to the present invention.

FIG. 2 is a cross-sectional view of a filtration device according to the present invention.

FIG. 3 is a diagram for explaining a filtration principle according to the present invention.

FIG. 4 is a view showing another embodiment of the filtration device according to the present invention.

FIG. 5 is a view showing another embodiment of the filtration device according to the present invention.

[Explanation of symbols]

1 cover, 2 clips, 3 ball bearings, 4
Rotary seal, 5 upper member, 6 filter element,
7 lower member, 8 ball bearing, 9 bearing block, 10 filter housing, 11 discharge lock, 12 inlet, 13 outlet.

Claims (13)

[Claims] 1. A filter device for removing particles in a fluid, comprising: a filter housing, a filter rotatably disposed in the filter housing, having a substantially cylindrical shape, and having a structure in which the fluid flows in from the outside. The filter element (6) is provided with an element, and all the particles that enter the area near the filter element (6) along the flow direction of the fluid are affected by the structure of the filter element (6) and are directed outward. It can be rotated at a high speed such that it is repelled, and the fluid flow is directed substantially in contact with the filter element (6), the circumferential direction of which is the rotation of the filter element (6). Filtration device characterized by matching in direction. 2. Filtration device according to claim 1, characterized in that the filter element (6) is cylindrical. 3. The filtering device according to claim 1 or 2, wherein the filter element (6) has a cylindrical cage (mesh member). 4. The filtering device according to any one of the preceding claims, wherein the structure of the filter element (6) is formed by a plurality of plate-shaped members extending substantially parallel to the longitudinal axis thereof. A filtration device characterized by: 5. Filtration device according to any of the preceding claims, characterized in that the structure of the filter element (6) is in the form of a grid. 6. Filtration device according to any of the preceding claims, characterized in that the structure of the filter element (6) comprises a filter cloth. 7. Filtration device according to any of the preceding claims, characterized in that the structure of the filter element (6) has a layer of porous ceramic material. 8. A filtering device according to claim 1 or 2, wherein the filter element (6) is subject to a centrifugal force of its substantially cylindrical filtering configuration at operating speed. A filtering device comprising a filter cloth. 9. A filtering device according to any of the preceding claims, wherein the filter housing (10) has a substantially circular cross section and is arranged such that fluid flows in substantially contact with the filter housing (10). Filtration device having an inlet (12) for a controlled fluid. 10. The filter device according to claim 1, wherein the filter housing (10) has a substantially cylindrical structure, and the filter housing is provided at an upper portion of the filter housing at a substantially central portion of the filter housing. A filtering device, characterized in that a fluid outlet (13) is formed. 11. Filtration device according to any of the preceding claims, characterized in that the filter housing (10) has a discharge lock (11) on its lower side. 12. The filtering device according to claim 1, wherein the filter element (6) has an upper member (5).
And a disk-shaped lower member (7) between which a filter medium (6 ') is provided, the filter element (6) having a substantially cylindrical outer contour and having an opening for fluid discharge. A filtering device formed on the upper member. 13. A filtration method for removing particles in a fluid, wherein the fluid is introduced into and in contact with a rotatable cylindrical filter surface, the fluid passing through the filter surface from the outside. It is a filtration method in which the flow direction of the fluid is the same as the rotation direction of the filter surface, the rotation speed of the filter surface is much faster than the flow speed of the fluid, and all the particles that have flowed in the vicinity of the filter surface pass through the holes on the filter surface. A filtration method characterized in that it does not pass through and settles in the filter, but bounces off from it by the action of the filter surface and is repelled outside the filter surface.